The progressive transformation of the historical fortifications has altered their extraordinary spatial potential, that of open space previously provided by the "glacis" and water which encompassed the historic centre. Redefine this void, which appears to us as a spatial opportunity open to many uses, is the key concern of our proposal. The objective is to find the qualities of a great empty periphery . It offers above all a space of recoil and creates a distance to the city which supports a mental image that we may seize. The spatial re-composition we propose is essentially the sculpting of the mass of trees and the remodeling of the slopes and topography. The sculpting of the vegetation consists of cutting, pruning, transplanting and planting trees in order to compose masses and voids, to reveal open areas sloping to the canal such as the historical "glacis". The transformation here concerns creating wide open spaces along the inner bank. A new traffic plan of the city, can provide the opportunity to in time reconfigure the outside edge of the canal. We propose that one lane of cars would be freed up, providing  spacious continuous promenade opened up for the benefit of both pedestrians and cyclists.